Effect of Constituents on the Viscosity of Glass near its Annealing Temperature

JSGT 1923 V07 T025-45

Among the fundamental physical properties of glass, one of the most important is its viscosity, because the ease with which a glass flows at various temperatures determines to a very large extent its melting and working properties, and these, in turn, whether or not glassware can be manufactured successfully. Besides influencing these properties, the viscosity of the glass in its nearly rigid condition also determines the temperature at which annealing is most suitably carried out and the range of temperature through which it is necessary to regulate carefully the cooling of the glass.

S. English